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Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp quốc tế đề tài: "Hétérogénéité spatiale d’une forêt tropicale humide de Sumatra : effet de la topographie sur la structure floristique. | 431 Ann Sei For 1997 54. 431 -446 Elsevier Inra Article original Hétérogénéité spatiale d une foret tropicale humide de Sumatra effet de la topographic sur la structure floristique V Trichon Laboratoire d écoìoịỊÌe terrestre UMR 5552 CNRS UPS 13. avenue ht Colonel-Roche HP 4403 31405 Toulouse cedes France Reụu le ler avril 1996 accepté le 3 juin 1996 Summary - Spatial heterogeneity of a tropical rain forest in Sumatra effect of topography on floristic structure. Tropical rain forests are characterized by a complex and spatially heterogeneous structure. It is essential to analyze the factors of this heterogeneity in order to set up sustainable management policies in these environments. We have studied the influence of topography on floristic structure considering 3 ha of forest with contrasted relief. Correspondance analysis has shown that topography acts through drainage leading to different specific compositions on ridge slope and valley. It operates also in relation to forest dynamics favouring pioneer species on steep slopes. In addition this influence decreases as topographic heterogeneity is reduced other factors related to forest internal characteristics then govern floristic structure. Moreover this study brings new data concerning floristic composition and ecology of forests in this area as well as topographical preferences of many species. Topography appears to be a key factor regarding the structure and the dynamics of tropical rain forests on contrasted relief and should be considered in modelling. tropical rain forest spatial heterogeneity floristic structure topography Sumatra Resume - Les forets tropicales humides se caractérisent par line structure complexe tres hétérogène dans 1 espace. L etude des facteurs responsables de cette hétérogệnéité est indispensable si Lon veut mettre en place des amcnagements durables dans ces milieux. A Sumatra sur line parcelle fores-tière de 3 ha au relief contrasté nous avons étudié Tinfluence de la topographic sur 1
